Sibbach v. Wilson
Encyclopedia
Sibbach v. Wilson, 312 U.S. 1
Case citation
Case citation is the system used in many countries to identify the decisions in past court cases, either in special series of books called reporters or law reports, or in a 'neutral' form which will identify a decision wherever it was reported...

  (1941), was a decision by the United States Supreme Court
Supreme Court of the United States
The Supreme Court of the United States is the highest court in the United States. It has ultimate appellate jurisdiction over all state and federal courts, and original jurisdiction over a small range of cases...

  in which the Court held that under American
United States
The United States of America is a federal constitutional republic comprising fifty states and a federal district...

  law important and substantial procedures
Procedural law
Procedural law or adjective law comprises the rules by which a court hears and determines what happens in civil lawsuit, criminal or administrative proceedings. The rules are designed to ensure a fair and consistent application of due process or fundamental justice to all cases that come before...

  are not substantive, rather they are still considered procedural
Procedural
Procedural may refer to:*Procedural programming, a computer programming concept*Procedural generation, a term used in connection with computer graphics applications to indicate that data is created algorithmically rather than directly specified by an artist...

, and federal law applies.

This was a post-Erie decision, and thus the decision whether to apply the law of the state of jurisdiction or uniform federal rules depended on whether the rule in question was procedural or substantive in nature.
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